A call is usually defaulted because the system doesn't know how to treat the call...either the call data was missing or the call came in by some other means without any call data or data that hasn't been screened correctly.
SCCS and SECC is designed to never just leave a caller hanging in limbo (I know some of you are laughing right about now)so it default the call. The defaulted call will dump to what ever the DFDN is of the CDN that it came in on.
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